The commit is pushed to "branch-rh7-3.10.0-229.7.2.vz7.9.x-ovz" and will appear
at https://src.openvz.org/scm/ovz/vzkernel.git
after rebase
------>
commit 3376535fa6f9b4798234579fee75bac2a1448bce
Author: Vladimir Davydov <vdavy...@virtuozzo.com>
Date: Wed Dec 2 19:09:48 2015 +0400
tcache: exert equal pressure on tmem and lru pages
shrinker->seeks is supposed to be an estimate of the number of disk
seeks needed to recreate an object. shrink_slab will divide lru scan
ratio over ->seeks to scan objects that need more seeks to be brought
back less intensively.
For most shrinkers (e.g. dcache, icache) ->seeks equals 2 (aka
DEFAULT_SEEKS), because rereading an object requires random IO (you need
seek to the object and seek back), in contrast to page cache which can
benefit from read-ahead. Hence dcache experiences half pressure exerted
upon lru pages.
However, tmem is not like dcache - tmem pages are created from lru pages
so they should receive the same pressure. That said, let's set ->seeks
to 1 for tmem shrinkers.
Signed-off-by: Vladimir Davydov <vdavy...@virtuozzo.com>
Reviewed-by: Kirill Tkhai <ktk...@odin.com>
---
mm/tcache.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/tcache.c b/mm/tcache.c
index e8ffa91..b8757cf 100644
--- a/mm/tcache.c
+++ b/mm/tcache.c
@@ -817,7 +817,7 @@ static unsigned long tcache_shrink_scan(struct shrinker
*shrink,
struct shrinker tcache_shrinker = {
.count_objects = tcache_shrink_count,
.scan_objects = tcache_shrink_scan,
- .seeks = DEFAULT_SEEKS,
+ .seeks = 1,
.flags = SHRINKER_NUMA_AWARE,
};
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